Easton Gibb and Son were contractors for Public Works, based at 9, Victoria Street, Westminster, London, S.W. It was founded by Alexander Easton Gibb - known more commonly as Easton Gibb (1841-1916) - in the 1870s. His son Alexander Gibb (1872-1958) joined the firm in 1900. Easton Gibb died in 1906 and the firm continued under the direction of Easton's son, Alexander, for sixteen years before he founded his own firm of consulting engineers (Sir Alexander Gibb and Partners) in 1922.

Easton Gibb and Son were responsible for the construction of Rosyth Naval Base; the original programme was accelerated so that it was brought into use during WWI.